More and more riders are choosing disc brakes, so why not upgrade to the Trek 3900 Disc 2009 Mountain Bike. Realistically, everything is identical from the 2009 Trek 3900 Disc and the Trek 3900, except the already stated disc brakes and a added $50, which we think is a good deal. If you missed in our previous review, the Trek 3900 Disc 2009 Mountain Bike also features Alpha White Aluminum frame in sizes 13, 16, 18, 19.5, 21, 22.5, and is a 8 speed.

Trek 3900 Disc 2009 Mountain Bike

(3 votes, average: 3.33 out of 5)
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Trek 3900 Disc 2009 Mountain Bike Frameset
Sizes: 13, 16, 18, 19.5, 21, 22.5″
Frame: Alpha White Aluminum w/externally relieved head tube, bi-axial down tube, disc compatible dropouts
Front Suspension: SR Suntour XCT V2 w/preload, 80mm
Rear Shock: n/a
Fork: n/a

Trek 3900 Disc 2009 Mountain Bike Wheels
Wheels: Alloy front hub, Shimano M475 rear hub; Matrix 550 rims w/brushed sidewalls
Tires: Bontrager Connection Trail, 26×2.0″; 27 tpi

Trek 3900 Disc 2009 Mountain Bike Drivetrain
Shifters: Shimano EF50, 8 speed
Front Derailleur: Shimano C050
Rear Derailleur: Shimano Acera
Crank: SR Suntour XCC-T102 42/34/24
Cassette: SRAM PG830 11-32, 8 speed
Pedals: Nylon platform

Trek 3900 Disc 2009 Mountain Bike Components
Saddle: Bontrager Approved
Seat Post: Bontrager SSR, 20mm offset
Handlebars: Bontrager Approved, 30mm rise
Stem: Bontrager Approved, 25 degree
Headset: VP-A76C-TK, 1 1/8″ semi-cartridge, sealed
Brakeset: Promax, mechanical disc w/Shimano EF50 levers